Question

我收到jinja2.exceptions.UndefinedError：登录到本地主机时'btn'是未定义的异常。 btn的定义正确，但仍然可以。我能否尽快获得帮助。先感谢您 Python代码-此代码为Python代码

from flask import Flask, render_template, request, send_file
from flask_sqlalchemy import SQLAlchemy
from send_email import send_email
from sqlalchemy.sql import  func
from werkzeug import secure_filename

app=Flask(__name__)
@app.route("/")
def index():
    return render_template("index.html")

@app.route("/success", methods=['POST'])
def success():
    global file
    if request.method=='POST':
        file=request.files["file"]
        file.save(secure_filename("uploaded" + file.filename))
        with open("uploaded"+file.filename,"a") as f :
            f.write("This was added later!")
        return render_template("index.html", btn="download.html")

@app.route("/download")
def download():
    return send_file("uploaded" + file.filename, attatchment_filename="yourfile.csv", as_attatchment=True)

if __name__ == '__main__':
    app.debug=True
    app.run()

HTML- 索引文件-这是主文件

<!DOCTYPE html>
<html lang="en">
    <title> Data Collector App</title>
    <head>
        <link href="../static/main.css" rel="stylesheet">
    </head>
    <body>
        <div class="container">
            <h1>Collecting Height</h1>
            <h3>Please Fill the Entries to get Population Statistics on Height</h3>
            <div class="message">
                {{text | safe}}
            </div>
            <form action="{{url_for('success')}}" method="POST" enctype="multipart/form-data">
                <input type="file" name="file" > <br>
                <button type="submit">Submit</button>
            </form>
            {%include btn ignore missing%}
        </div>
    </body>
</html>

下载文件-这是要下载的html文件。导入文件后，此html代码将在同一index.html页面中创建一个按钮，以便我也可以对同一文件进行下标

<!DOCTYPE html>
<html lang="en">
        <div class="download">
            <a href= {{url_for('download')}} target="blank"> <button class="btn"> Download </button></a>
        </div>
</html>

Answer 1

面临同样的问题。我的解决方法是替换：

{% include btn ignore missing %}

使用

{% if btn %}
     {% include btn %}
{% endif %}

jinja2.exceptions.UndefinedError：'btn'未定义

1 个答案: